Fatto generale: 81370 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 81370 is an unremarkable number.
Trivia: 81370 is a boring number.
Data storica: October 13th is the day in 1983 that Ameritech Mobile Communications (now AT&T) launched the first US cellular network in Chicago, Illinois.